Given that skyrmions are notable manifestations of these RT chiral domain walls, [1]} we developed a tunable RT skyrmion platform based on the multilayer stacks of [Ir/Fe/Co/Pt]\(_{20}\) .[2]} By harnessing the large and opposite signs of DMI generated from Fe/Ir and Co/Pt interfaces, we demonstrated that the additive enhancement of DMI can stabilize skyrmions with diameters as small as 30 nm. By further varying the Fe and Co thicknesses, the competing magnetic parameters D, K\(_\mathrm {eff}\)  and A can be modulated to tune the skyrmion size (2x) and density (10x). Crucially, by tuning these magnetic parameters, we illustrated a smooth crossover from a sparsely populated skyrmion configuration (Section2d, left) to a short-range hexagonally ordered skyrmion lattice (Section2d, right). This enables the creation of designer skyrmion configurations which can be harnessed for independent lines of device applications.
